How do i stop this weird feeling?

So two years ago while on vacation I started feeling really weird and it was like the whole world was spinning. This usually happened when there were large groups of people and I kept telling my self that when i got home from vacation this feeling would stop. I told my parents how i felt and they became very concerned, my mother gave me vitamins ( because she thought it was a physical issue and not a mental one, said that i wasnt very healthy, which makes people feel dizzy. I lied to my parents and told them that I felt better because I was eating well and taking the vitamins, I didnt want to worry them and ruin the vacation. Now, I feel like this everyday. like Im experiencing a dream and when I look at myself I just dont feel ‘normal’. Id stare down at my hands and Id be scared because I feel like they dont belong to me and even though I can control everything, I feel like I am being controlled by somebody else. or I am in another persons body. I think I need a doctor or something, but Im very scared of telling my parents. will a doctor help to stop this?